UPN suffixes assigned to an organizational unit are stored in the upnSuffixes attribute in the Organizational Unit object.

The default UPN is contained in the Canonical Name attribute on the Partitions container object in the configuration naming context. The default UPN suffix identifies the domain in which the user account is contained. When you create a user account in Active Directory, the default UPN suffix is the DNS name of the first domain in your domain tree.

If you create user accounts by using Active Directory Users and Computers, every user must have a UPN.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if they're not included in the permissions assigned to you. To see what permissions you need, see the "Recipient Provisioning Permissions" section in the Mailbox Permissions topic.

To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn’t accept input data.

To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn’t return data.

EXAMPLE 1

This example returns all of the UPN suffixes for the Active Directory forest.

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Get-UserPrincipalNamesSuffix